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EWSR1::POU2AF3(COLCA2) Sarcoma: An Aggressive, Polyphenotypic Sarcoma With a Head and Neck Predilection
Olena Koshyk1, Carina A Dehner2, Mari F C M van den Hout3
1Department of Pathology, Charles University, Faculty of Medicine in Plzeň, Czech Republic; Medical Laboratory CSD, Ltd, Kyiv, Ukraine.
Summary
EWSR1::POU2AF3 (COLCA2) sarcomas are rare cancers often found in the head and neck. These aggressive tumors show varied morphology and a high rate of metastasis, requiring multimodal treatment.
Area of Science:
- Oncology
- Pathology
- Genetics
Background:
- EWSR1::POU2AF3 (COLCA2) sarcomas are a recently identified group of neoplasms.
- These tumors exhibit a predilection for the head and neck region.
Purpose of the Study:
- To report experience with 8 cases of EWSR1::POU2AF3 sarcomas.
- To characterize their clinical behavior, morphologic spectrum, and genetic underpinnings.
Main Methods:
- Case series review of 8 patients with EWSR1::POU2AF3 sarcomas.
- Analysis of clinical data, histopathology, immunohistochemistry, and RNA sequencing.
- Fluorescence in situ hybridization (FISH) for EWSR1 gene rearrangement.
Main Results:
- Tumors occurred in the head/neck (4 cases) and other sites.
- Median follow-up was 32 months, with 5 patients developing metastases and 3 local recurrence.
- Morphologic subgroups included bland spindle cell tumors and overtly malignant neuroendocrine-appearing round cell tumors with divergent differentiation.
- EWSR1::POU2AF3 gene fusion was confirmed in all cases; EWSR1 rearrangement by FISH in 5 cases.
Conclusions:
- EWSR1::POU2AF3 sarcomas have a head/neck predilection and aggressive behavior.
- The morphologic spectrum includes bland spindle cell and divergent differentiating tumors.
- Multimodal therapy is often indicated due to high metastatic potential.
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